객관식
How many neutrons are present in an atom of lead (Pb) with a mass number of 208?
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2. Atoms & Elements
The Atom
Multiple Choice
How many protons are present in a neutral atom of aluminum?
A
14
B
27
C
13
D
11
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검증된 단계별 안내1
Recall that the number of protons in a neutral atom is equal to its atomic number.
Identify the element given in the problem, which is aluminum.
Look up the atomic number of aluminum on the periodic table; this number represents the number of protons.
Understand that the atomic number is unique to each element and defines the element's identity.
Conclude that the number of protons in a neutral aluminum atom is equal to its atomic number.
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